html {
  position: relative;
  min-height: 100%;
}

body {
  margin-bottom: 3rem !important; /* Margin bottom by footer height */
}

.footer {
  position: absolute;
  bottom: 0;
  width: 100%;
  height: 3rem;
  line-height: 3rem;
  background-color: #f5f5f5;
}